<template>
  <div id="app">
    <div class="container">
      <!-- 顶部搜索框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(item) in list" :key="item.id">
            <td>{{item.id}}</td>
            <td>{{item.name}}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{red:item.price>100}" >{{item.price}}</td>
            <td>{{item.time}}</td>
            <td><a href="#" @click.prevent="del(item.id)">删除</a></td>
          </tr>
         <tr style="background-color: #EEE">
              <td>统计:</td>
              <td colspan="2">总价钱为: {{total.toFixed(2)}}</td>
              <td colspan="2">平均价: {{total/list.length}}</td>
        </tr>
          
        </tbody>
        <tfoot v-if="list.length===0">
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input type="text" class="form-control" placeholder="资产名称" v-model.trim="name" />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input type="text" class="form-control" placeholder="价格" v-model.number="price" />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="add">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>

export default {
  
  data() {
    return {
      name: '', // 名称
      price: 0, // 价格
      list:JSON.parse(localStorage.getItem('list')) ||[
        { id: 100, name: '外套', price: 199, time: new Date('2010-08-12') },
        { id: 101, name: '裤子', price: 34, time: new Date('2013-09-01') },
        { id: 102, name: '鞋', price: 25.4, time: new Date('2018-11-22') },
        { id: 103, name: '头发', price: 19900, time: new Date('2020-12-12') },
      ]
    }
  },
  methods:{
    del(id){
      this.list=this.list.filter(item=>item.id!==id)
    },
    add(){
      if(!this.name) return alert('请输入正确的名字和价格')
      if(!this.price) return alert('请输入正确的名字和价格')
      this.list.push({id:+new Date(),name:this.name,price:this.price,time:new Date()})
    }
  },
  computed:{
    total(){
      return this.list.reduce((sum,item)=>sum+item.price,0)
    }
  },
  watch:{
    list:{
      deep:true,
      immediate:true,
      handler(newValue){
        localStorage.setItem('list',JSON.stringify(newValue) )

      }
    }
  }
}
</script>

<style>
.red {
  color: red;
}
</style>
